package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;



    //菜品起售或停售


    //新增菜品和对应口味
    @Override
    @Transactional //事务注解
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //像菜品表插入一条数据
        dishMapper.insert(dish);

        //获取Insert语句生成的主键值  这里不懂
        Long dishId = dish.getId();
        //向口味表插入多条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //防止传入空参数
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    //菜品分页查询  利用PageHelper
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前的菜品是否在起售中，如果在无法删除
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //如果菜品处于起售无法删除，并且抛出一个无法删除的异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断菜品是否和套餐关联，如果关联就无法删除
        List<Long> setmealIds = setmealDishMapper.getSetmealDishIdsByDishId(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        for(Long id : ids){
//            dishMapper.deleteById(id);
//            dishFlavorMapper.deleteBydishId(id);
//        }
//
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteBydishIds(ids);

        //删除菜品关联的口味数据

    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据口味查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品Id查询口味数据
        List<DishFlavor> dishFlavors =  dishFlavorMapper.getBydishId(id); //不太懂为什么要用集合，返回一组数据不用集合也可以吧，为什么返回菜品有多个
        //将查到的数据进行封装
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    //根据id修改菜品信息和对应的口味信息
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish); //吧dishDto属性拷贝到dish中 只会复制两个对象中名称相同且类型兼容的属性
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteBydishId(dish.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getBydishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
